Comcores Radio over Ethernet Gateway for Future Fronthaul Networks - - PowerPoint PPT Presentation

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Comcores Radio over Ethernet Gateway for Future Fronthaul Networks

FG IMT-2020 Workshop and Demo Day Anders Lund, Comcores ApS Bomin Li, Comcores ApS Thomas Nørgaard, Comcores ApS

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Agenda

• About Comcores
• Motivation for Ethernet Based Fronthaul
• Comcores Overview on next generation fronthaul networks
• Demo setup
• Demo results

Comcores Headquarter

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About Comcores

• Established in 2014
• Globally oriented high-tech company,

headquartered in Scion DTU Science Park, 20 min outside Copenhagen, Denmark

• IP cores and design services for

communication systems

• Specialized in digital radio systems

Comcores Headquarter

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Motivation for Ethernet Based Fronthaul

• New fronthaul interface technologies are required to satisfy various RAN

deployment and evolution requirements, and reduce fronthaul transmission costs

• Current dedicated point-to-point connection between BBUs and RRUs (such as

CPRI/OBSAI) will evolve to many-to-many fronthaul mainstream switch networks (such as Ethernet) due to cost, availability and flexibility

• Fronthaul architecture is migrating from traditional RAN where single BBU

connects to single/few RRUs to architectures where multiple centralized BBUs connect to multiple RRUs making a packet switched technology ideal

• Ethernet is a widely adopted & nearly ubiquitous standard technology

CPRI Baseband Radio Eth Radio Baseband Pool Radio Radio

Packet Fronthaul

Eth Eth Eth

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Comcores Overview on next generation fronthaul networks

BaseBand

CPRI fiber connection Virtual BBU Pool

BaseBand BaseBand BaseBand

RRH

RF

RRH RRH

RF

Time Sensitive Network (TSN) SDN Controller Aggregator CPRI GW C&M Ethernet Ethernet

RF RF

L1 Offload

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Comcores gateway

• Fits on both radio and base band side
• support of CPRI, new radio interface and high speed Ethernet

Comcores All-in-One RAU system Virtual BBU

Backhaul Ethernet Fronthaul Network (NGFI)

RAU

Pico Macro All-in-One Pico

Comcores RAU system

CPRI

RF/DFE NGFI Split x L1 offload Split 4 RoE

Ethernet TSN MAC & PCS

Pico Macro vBBU

vBBU

L1 processing resources L1 processing resources L1 processing resources L1 processing resources L2/L3 processing resources Orchestrator RoE

Ethernet TSN MAC & PCS

Virtual L1 resource pool RAU RAU RAU NGFI Split x RoE

Eth TSN MAC & PCS

RF/ DFE vBBU

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Demo setup

• IEEE P1914.3 - CPRI over Ethernet mapper/de-mapper
• IEEE P1914.1 - Next Generation Fronthaul Interface
• IEEE 802.3 - Time Sensitive Network features
• IEEE 1588v2 – time stamp

BBU Gateway

TSN MAC RoE RX (Structure Agnostic) RF (Spectrum Analyzer)

RRH Gateway

L1 Offload RoE RX (Native)

Varying number

• f LTE modulated

symbols

Control & Management

I Q

TSN MAC RoE TX (Structure Agnostic) RoE TX (Native)

Varying number

• f LTE modulated

symbols

Control & Management CPU baseband processing (ROM pre-loaded)

Ethernet- based FH

CPRI tester (Sarokal) CPRI tester (Sarokal)

NGFI (Split 4) CPRI over Ethernet (Structure Aware)

RF RoE RX (Structure Aware) CPRI tester (Sarokal)

CPRI over Ethernet (Structure Agnostic)

RoE TX (Structure Agnostic) CPRI tester (Sarokal)

NGFI (Split 4) CPRI over Ethernet (Structure Aware) CPRI over Ethernet (Strucutre Agnostic

IEEE 1588v2

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Lab setup

• Xilinx VC709 FPGA demonstration platform
• CPRI verification by Sarokal X-STEP tester
• LTE demondulation verification by Keysight PXA

spectrum analyzer

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CPRI over Ethernet - motivation

• C-RAN
• Bridge to carry current CPRI flows in future Ethernet based fronthaul

networks

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CPRI over Ethernet - result

• Synchronous traffic
• ver asynchronous

networks

• Lossless transmission

based on the clock recovery and delay control schemes

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Intra-PHY Split Proof of Concept

Source: ”White Paper of Next Generation Fronthaul Interface”

SFP+ SFP+ TSN MAC RoE Tx R A M

LTE Data ROM BBU GEN

LTE Time TSN MAC RoE Rx

L1 DL Offload R A M LTE Time

AD9361

Keysight PXA Spectrum Analyzer

SI5324

@156.25 MHz

I2C MicroBlaze

AXI GPIO AXI SPI AD9361 Digital interface

FMCOMMS3

Tx1

ctrl

Data interface

RF

122.88 MHz

F M C

Ref clk Tx FIFO eth_clk

BBU RRH

Keysight MXG Signal Generator

10G Ethernet

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PDSCH cell load

• PDSCH cell load is dependent on the real traffic for Intra-PHY splits

Downlink shared channel for user data

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Low load in a 10 MHz cell

• Succesful cell synchronization
• 1 user allocated 1 RB (bottom)
• Autodetection of cell configuration
• Autodetection of user allocation

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Peak load in a 10 MHz cell

• Full allocation of user data (PDSCH)
• < 1 % EVM
• ~160 Mbps load on Ethernet link
• 1:4 reduction compared to CPRI

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Acknowledgement